By going to the Medal Details screen and tapping on "Inspect", a fullscreen version of the artwork can be viewed.

In the English version, Supernova - Key Art #19 was only available in the 10/27/18 - 11/19/18 Supernova - Key Art #19 deal. In this deal, players had a small chance of drawing a boosted version of Supernova - Key Art #19 that has 1,000 more base strength and defense.[1]